Heriot-Watt Team Demonstrates All-Optical Polarization Control 10,000x Faster Than Electronics
Tags Hardware · Infrastructure
Researchers at Heriot-Watt University demonstrated all-optical polarization control using a thin film of aluminium zinc oxide (AZO), achieving control approximately 10,000 times faster than state-of-the-art electronic approaches and 100,000 times stronger than previously recorded. The process operates on sub-picosecond timescales using femtosecond optical pumping to induce plasma symmetry breaking. The same unpatterned film can sequentially behave as birefringent, dichroic, or optically active depending on pump conditions. Published in Nature Photonics, with collaborators from Purdue University, University of Brescia, and University of L'Aquila.
Technical significance
All-optical polarization control at these speeds enables compact ultrafast modulators, dynamic metasurfaces, and non-reciprocal photonic devices without moving parts. Applications span quantum optics, secure communications, and medical diagnostics. The use of AZO — a material already used in touchscreens and solar panels — means the technology could leverage existing manufacturing infrastructure.